Socrates once warned his students not to look to close to woven pictures. One would never learn something about the nature of numbers from such observations. But who would ever think of something like that?

	Arithmetic and Weaving in Antiquity A pebble proof of the incommensurability in the square

	Socrates once warned his students not to look to close to woven pictures. One would never learn something about the nature of numbers from such observations. But who would ever think of something like that?